scale text object size
First you must go to the dopesheet, then select the text you want to animate. In the dopesheet you see four keyframes, those keyframes you have to change. So go with the timeline (the green line in the dopesheet) to the first keyframe, the values of the scale is in yellow (that means it is keyframed) so change the x value to .5 and click on I to insert a keyframe (make sure you are in the 3D view, or above the value when you hit the I. Go with the timeline to the next keyframe, you are on the right frame if the values from the scale are yellow and repeat everything.